====================================== | [ 19.814690][ T429] #6: ffffffffba807e88 (rtnl_mutex){+.+.}-{4:4}, at: nsim_create (drivers/net/netdevsim/netdev.c:686 drivers/net/netdevsim/netdev.c:731 drivers/net/netdevsim/netdev.c:802) netdevsim | [ 19.814989][ T429] #7: ffffffffba7f6a70 ((netdev_chain).rwsem){++++}-{4:4}, at: blocking_notifier_call_chain (kernel/notifier.c:380 kernel/notifier.c:368) | [ 19.815319][ T429] | [ 19.815319][ T429] stack backtrace: [ 19.815772][ T429] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011 [ 19.815975][ T429] Call Trace: [ 19.816100][ T429] [ 19.816185][ T429] dump_stack_lvl (lib/dump_stack.c:123) [ 19.816355][ T429] print_deadlock_bug (kernel/locking/lockdep.c:3040) [ 19.816521][ T429] validate_chain (kernel/locking/lockdep.c:3894) [ 19.816688][ T429] ? __pfx_validate_chain (kernel/locking/lockdep.c:3860) [ 19.816855][ T429] ? hlock_class (./arch/x86/include/asm/bitops.h:227 ./arch/x86/include/asm/bitops.h:239 ./include/asm-generic/bitops/instrumented-non-atomic.h:142 kernel/locking/lockdep.c:228) [ 19.817019][ T429] ? mark_lock (kernel/locking/lockdep.c:4727 (discriminator 3)) [ 19.817143][ T429] __lock_acquire (kernel/locking/lockdep.c:5226) [ 19.817307][ T429] ? udp_tunnel_nic_netdevice_event (net/ipv4/udp_tunnel_nic.c:909) [ 19.817513][ T429] ? really_probe (drivers/base/dd.c:579 drivers/base/dd.c:658) [ 19.817678][ T429] lock_acquire.part.0 (kernel/locking/lockdep.c:467 kernel/locking/lockdep.c:5851) [ 19.817840][ T429] ? blocking_notifier_call_chain (kernel/notifier.c:380 kernel/notifier.c:368) [ 19.818043][ T429] ? entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130) [ 19.818250][ T429] ? find_held_lock (kernel/locking/lockdep.c:5339) [ 19.818412][ T429] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5814) [ 19.818575][ T429] ? trace_lock_acquire (./include/trace/events/lock.h:24 (discriminator 37)) [ 19.818738][ T429] ? lock_acquire (kernel/locking/lockdep.c:5822) [ 19.818899][ T429] ? blocking_notifier_call_chain (kernel/notifier.c:380 kernel/notifier.c:368) [ 19.819101][ T429] down_read (./arch/x86/include/asm/preempt.h:79 kernel/locking/rwsem.c:1246 kernel/locking/rwsem.c:1261 kernel/locking/rwsem.c:1526) [ 19.819227][ T429] ? blocking_notifier_call_chain (kernel/notifier.c:380 kernel/notifier.c:368) [ 19.819433][ T429] ? __pfx_down_read (kernel/locking/rwsem.c:1522) [ 19.819597][ T429] ? notifier_call_chain (kernel/notifier.c:85 (discriminator 2)) [ 19.819768][ T429] blocking_notifier_call_chain (kernel/notifier.c:380 kernel/notifier.c:368) [ 19.819932][ T429] call_netdevice_notifiers (net/core/dev.c:2062) [ 19.820096][ T429] ? __pfx_call_netdevice_notifiers (net/core/dev.c:2062) [ 19.820298][ T429] ? mutex_is_locked (./arch/x86/include/asm/atomic64_64.h:15 ./include/linux/atomic/atomic-arch-fallback.h:2583 ./include/linux/atomic/atomic-long.h:38 ./include/linux/atomic/atomic-instrumented.h:3189 kernel/locking/mutex.h:47 kernel/locking/mutex.c:66) [ 19.820467][ T429] udp_tunnel_nic_register (./include/net/udp_tunnel.h:138 net/ipv4/udp_tunnel_nic.c:825) [ 19.820631][ T429] udp_tunnel_nic_netdevice_event (net/ipv4/udp_tunnel_nic.c:893) [ 19.820842][ T429] notifier_call_chain (kernel/notifier.c:85 (discriminator 2)) [ 19.821007][ T429] blocking_notifier_call_chain (kernel/notifier.c:381 kernel/notifier.c:368) [ 19.821171][ T429] register_netdevice (./include/linux/notifier.h:207 net/core/dev.c:10676) [ 19.821336][ T429] ? __pfx_register_netdevice (net/core/dev.c:10532) [ 19.821501][ T429] nsim_create (drivers/net/netdevsim/netdev.c:742 drivers/net/netdevsim/netdev.c:802) netdevsim [ 19.821678][ T429] __nsim_dev_port_add (drivers/net/netdevsim/dev.c:1393) netdevsim [ 19.821892][ T429] ? mark_lock (kernel/locking/lockdep.c:4727 (discriminator 3)) [ 19.822016][ T429] ? __pfx___nsim_dev_port_add (drivers/net/netdevsim/dev.c:1357) netdevsim [ 19.822229][ T429] ? lockdep_hardirqs_on_prepare (kernel/locking/lockdep.c:4347 kernel/locking/lockdep.c:4406) [ 19.822434][ T429] nsim_dev_port_add_all (drivers/net/netdevsim/dev.c:1449) netdevsim [ 19.822647][ T429] nsim_drv_probe (drivers/net/netdevsim/dev.c:1607) netdevsim [ 19.822829][ T429] ? __pfx_nsim_drv_probe (drivers/net/netdevsim/dev.c:1528) netdevsim [ 19.823041][ T429] ? kernfs_create_link (fs/kernfs/symlink.c:48) [ 19.823208][ T429] ? kernfs_put (./arch/x86/include/asm/atomic.h:67 (discriminator 1) ./include/linux/atomic/atomic-arch-fallback.h:2278 (discriminator 1) ./include/linux/atomic/atomic-instrumented.h:1384 (discriminator 1) fs/kernfs/dir.c:557 (discriminator 1)) [ 19.823335][ T429] ? sysfs_do_create_link_sd (fs/sysfs/symlink.c:48) [ 19.823503][ T429] really_probe (drivers/base/dd.c:579 drivers/base/dd.c:658) [ 19.823669][ T429] __driver_probe_device (drivers/base/dd.c:800) [ 19.823832][ T429] driver_probe_device (drivers/base/dd.c:830) [ 19.823998][ T429] __device_attach_driver (drivers/base/dd.c:959) [ 19.824162][ T429] ? __pfx___device_attach_driver (drivers/base/dd.c:922) [ 19.824364][ T429] bus_for_each_drv (drivers/base/bus.c:459) [ 19.824529][ T429] ? __pfx_bus_for_each_drv (drivers/base/bus.c:447) [ 19.824691][ T429] ? bus_to_subsys (drivers/base/bus.c:85) [ 19.824853][ T429] ? __pfx___lock_release (kernel/locking/lockdep.c:5501) [ 19.825016][ T429] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5814) [ 19.825186][ T429] __device_attach (drivers/base/dd.c:1030) [ 19.825349][ T429] ? __pfx___device_attach (drivers/base/dd.c:1001) [ 19.825512][ T429] ? bus_to_subsys (drivers/base/bus.c:85) [ 19.825678][ T429] ? do_raw_spin_unlock (./arch/x86/include/asm/atomic.h:23 ./include/linux/atomic/atomic-arch-fallback.h:457 ./include/linux/atomic/atomic-instrumented.h:33 ./include/asm-generic/qspinlock.h:57 kernel/locking/spinlock_debug.c:101 kernel/locking/spinlock_debug.c:141) [ 19.825843][ T429] bus_probe_device (drivers/base/bus.c:534) [ 19.826006][ T429] device_add (drivers/base/core.c:3672) [ 19.826166][ T429] ? __pfx_device_add (drivers/base/core.c:3548) [ 19.826331][ T429] ? __init_waitqueue_head (./include/linux/list.h:37 kernel/sched/wait.c:12) [ 19.826497][ T429] new_device_store (drivers/net/netdevsim/bus.c:443 drivers/net/netdevsim/bus.c:173) netdevsim [ 19.826710][ T429] ? __pfx_new_device_store (drivers/net/netdevsim/bus.c:142) netdevsim [ 19.826921][ T429] ? __pfx_sysfs_kf_write (fs/sysfs/file.c:132) [ 19.827082][ T429] ? sysfs_file_ops (fs/sysfs/file.c:31 (discriminator 1)) [ 19.827247][ T429] ? __pfx_sysfs_kf_write (fs/sysfs/file.c:132) [ 19.827408][ T429] kernfs_fop_write_iter (fs/kernfs/file.c:334) [ 19.827576][ T429] vfs_write (fs/read_write.c:586 fs/read_write.c:679) [ 19.827699][ T429] ? __pfx_vfs_write (fs/read_write.c:660) [ 19.827862][ T429] ? __lock_release (kernel/locking/lockdep.c:5525) [ 19.828024][ T429] ? do_user_addr_fault (./include/linux/rcupdate.h:347 ./include/linux/rcupdate.h:880 ./include/linux/mm.h:742 arch/x86/mm/fault.c:1340) [ 19.828190][ T429] ? __pfx___up_read (kernel/locking/rwsem.c:1337) [ 19.828359][ T429] ksys_write (fs/read_write.c:731) [ 19.828483][ T429] ? __pfx_ksys_write (fs/read_write.c:721) [ 19.828645][ T429] ? do_user_addr_fault (./include/linux/rcupdate.h:882 ./include/linux/mm.h:742 arch/x86/mm/fault.c:1340) [ 19.828809][ T429] do_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83) [ 19.828977][ T429] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130) [ 19.829182][ T429] RIP: 0033:0x7f4d50962b77 [ 19.829351][ T429] Code: 0b 00 f7 d8 64 89 02 48 c7 c0 ff ff ff ff eb b7 0f 1f 00 f3 0f 1e fa 64 8b 04 25 18 00 00 00 85 c0 75 10 b8 01 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 51 c3 48 83 ec 28 48 89 54 24 18 48 89 74 24 All code ======== 0: 0b 00 or (%rax),%eax 2: f7 d8 neg %eax 4: 64 89 02 mov %eax,%fs:(%rdx) 7: 48 c7 c0 ff ff ff ff mov $0xffffffffffffffff,%rax e: eb b7 jmp 0xffffffffffffffc7 10: 0f 1f 00 nopl (%rax) 13: f3 0f 1e fa endbr64 17: 64 8b 04 25 18 00 00 mov %fs:0x18,%eax 1e: 00 1f: 85 c0 test %eax,%eax 21: 75 10 jne 0x33 23: b8 01 00 00 00 mov $0x1,%eax 28: 0f 05 syscall 2a:* 48 3d 00 f0 ff ff cmp $0xfffffffffffff000,%rax <-- trapping instruction 30: 77 51 ja 0x83 32: c3 ret 33: 48 83 ec 28 sub $0x28,%rsp 37: 48 89 54 24 18 mov %rdx,0x18(%rsp) 3c: 48 rex.W 3d: 89 .byte 0x89 3e: 74 24 je 0x64 Code starting with the faulting instruction =========================================== 0: 48 3d 00 f0 ff ff cmp $0xfffffffffffff000,%rax 6: 77 51 ja 0x59 8: c3 ret 9: 48 83 ec 28 sub $0x28,%rsp d: 48 89 54 24 18 mov %rdx,0x18(%rsp) 12: 48 rex.W 13: 89 .byte 0x89 14: 74 24 je 0x3a [ 19.829935][ T429] RSP: 002b:00007ffcfac23028 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 [ 19.830181][ T429] RAX: ffffffffffffffda RBX: 00007f4d50748140 RCX: 00007f4d50962b77 [ 19.830426][ T429] RDX: 0000000000000009 RSI: 000055f54c81e680 RDI: 0000000000000006 [ 19.830670][ T429] RBP: 0000000000000009 R08: 0000000000000000 R09: 0000000000000000 [ 19.830917][ T429] R10: 0000000000000002 R11: 0000000000000246 R12: 00007f4d42800c40 Finger prints: print_deadlock_bug:validate_chain:__lock_acquire:down_read:blocking_notifier_call_chain