bisecting cause commit starting from e6827d1abdc9b061a57d7b7d3019c4e99fabea2f
building syzkaller on 70c104a18f3d409bc6dde950b50258d3d280d99b
testing commit e6827d1abdc9b061a57d7b7d3019c4e99fabea2f with gcc (GCC) 8.1.0
kernel signature: d2d5ee652ae3a3133cf72124e1856e3f7bb3b576991c78291792b44464f5e90c
run #0: crashed: INFO: rcu detected stall in rtnl_newlink
run #1: crashed: INFO: rcu detected stall in rtnl_newlink
run #2: crashed: INFO: rcu detected stall in rtnl_newlink
run #3: crashed: INFO: rcu detected stall in rtnl_newlink
run #4: crashed: INFO: rcu detected stall in rtnl_newlink
run #5: crashed: INFO: rcu detected stall in rtnl_newlink
run #6: crashed: INFO: rcu detected stall in rtnl_newlink
run #7: crashed: INFO: rcu detected stall in rtnl_newlink
run #8: crashed: INFO: rcu detected stall in rtnl_newlink
run #9: boot failed: can't ssh into the instance
testing release v5.7
testing commit 3d77e6a8804abcc0504c904bd6e5cdf3a5cf8162 with gcc (GCC) 8.1.0
kernel signature: 731bc70cfcf51e7cd24a865626b6929d98823073a776cd7b81aac55e8f68db59
all runs: crashed: INFO: rcu detected stall in rtnl_newlink
testing release v5.6
testing commit 7111951b8d4973bda27ff663f2cf18b663d15b48 with gcc (GCC) 8.1.0
kernel signature: b3d330b363f54a0ae180927e56452286df757511d41fc42df515d843cfae8a0e
run #0: crashed: KASAN: use-after-free Write in __alloc_skb
run #1: crashed: INFO: rcu detected stall in rtnl_newlink
run #2: crashed: INFO: rcu detected stall in rtnl_newlink
run #3: crashed: INFO: rcu detected stall in rtnl_newlink
run #4: crashed: INFO: rcu detected stall in rtnl_newlink
run #5: crashed: INFO: rcu detected stall in rtnl_newlink
run #6: crashed: INFO: rcu detected stall in rtnl_newlink
run #7: crashed: INFO: rcu detected stall in rtnl_newlink
run #8: crashed: INFO: rcu detected stall in rtnl_newlink
run #9: crashed: INFO: rcu detected stall in rtnl_newlink
testing release v5.5
testing commit d5226fa6dbae0569ee43ecfc08bdcd6770fc4755 with gcc (GCC) 8.1.0
kernel signature: f6ab518241a626719ef6a29185b5dfa17c7b6be1d93142a69c55fce208746075
all runs: crashed: INFO: rcu detected stall in rtnl_newlink
testing release v5.4
testing commit 219d54332a09e8d8741c1e1982f5eae56099de85 with gcc (GCC) 8.1.0
kernel signature: b4cc2cbdc8f04b88775c0b171f2afcf1ecb1dc1a4ed601b6cfb5e8992b676772
all runs: crashed: INFO: rcu detected stall in rtnl_newlink
testing release v5.3
testing commit 4d856f72c10ecb060868ed10ff1b1453943fc6c8 with gcc (GCC) 8.1.0
kernel signature: 46ece5c6d7f01ae80ff68cd01c2ea86a6d840ff7fc89778019e7baee7ef6cc5d
run #0: crashed: KASAN: use-after-free Write in __alloc_skb
run #1: crashed: KASAN: use-after-free Write in __alloc_skb
run #2: crashed: INFO: rcu detected stall in rtnl_newlink
run #3: crashed: INFO: rcu detected stall in rtnl_newlink
run #4: crashed: INFO: rcu detected stall in rtnl_newlink
run #5: crashed: INFO: rcu detected stall in rtnl_newlink
run #6: crashed: INFO: rcu detected stall in rtnl_newlink
run #7: crashed: INFO: rcu detected stall in rtnl_newlink
run #8: crashed: INFO: rcu detected stall in rtnl_newlink
run #9: crashed: INFO: rcu detected stall in rtnl_newlink
testing release v5.2
testing commit 0ecfebd2b52404ae0c54a878c872bb93363ada36 with gcc (GCC) 8.1.0
kernel signature: 5aadf92f5a9928a84bfc80ebf6f3aaf7c7ce662b991015ec2a6505ff42e5efba
all runs: crashed: INFO: rcu detected stall in rtnl_newlink
testing release v5.1
testing commit e93c9c99a629c61837d5a7fc2120cd2b6c70dbdd with gcc (GCC) 8.1.0
kernel signature: 8aa22f7ed6fbb1c6d3ceb2b53e8f45f6f04b23cec963b43cfb09c9d71698d375
run #0: crashed: KASAN: use-after-free Write in __alloc_skb
run #1: crashed: KASAN: use-after-free Write in __alloc_skb
run #2: crashed: INFO: rcu detected stall in rtnl_newlink
run #3: crashed: INFO: rcu detected stall in rtnl_newlink
run #4: crashed: INFO: rcu detected stall in rtnl_newlink
run #5: crashed: INFO: rcu detected stall in rtnl_newlink
run #6: crashed: INFO: rcu detected stall in rtnl_newlink
run #7: crashed: INFO: rcu detected stall in rtnl_newlink
run #8: crashed: INFO: rcu detected stall in rtnl_newlink
run #9: crashed: INFO: rcu detected stall in rtnl_newlink
testing release v5.0
testing commit 1c163f4c7b3f621efff9b28a47abb36f7378d783 with gcc (GCC) 8.1.0
kernel signature: 7cb03fa4a8c7c7875fc9367874e6981131a98a818c1f6e03c9eff7fab2549017
run #0: crashed: KASAN: use-after-free Write in __alloc_skb
run #1: crashed: KASAN: use-after-free Write in __alloc_skb
run #2: crashed: INFO: rcu detected stall in rtnl_newlink
run #3: crashed: INFO: rcu detected stall in rtnl_newlink
run #4: crashed: INFO: rcu detected stall in rtnl_newlink
run #5: crashed: INFO: rcu detected stall in rtnl_newlink
run #6: crashed: INFO: rcu detected stall in rtnl_newlink
run #7: crashed: INFO: rcu detected stall in rtnl_newlink
run #8: crashed: INFO: rcu detected stall in rtnl_newlink
run #9: crashed: INFO: rcu detected stall in rtnl_newlink
testing release v4.20
testing commit 8fe28cb58bcb235034b64cbbb7550a8a43fd88be with gcc (GCC) 8.1.0
kernel signature: 5f6d4112144c4b9ea32517dec8e064f9a0715ed08ad4cc0937e7f4fa43f01731
run #0: crashed: KASAN: use-after-free Write in __alloc_skb
run #1: crashed: INFO: rcu detected stall in rtnl_newlink
run #2: crashed: INFO: rcu detected stall in rtnl_newlink
run #3: crashed: INFO: rcu detected stall in rtnl_newlink
run #4: crashed: INFO: rcu detected stall in rtnl_newlink
run #5: crashed: INFO: rcu detected stall in rtnl_newlink
run #6: crashed: INFO: rcu detected stall in rtnl_newlink
run #7: crashed: INFO: rcu detected stall in rtnl_newlink
run #8: crashed: INFO: rcu detected stall in rtnl_newlink
run #9: crashed: INFO: rcu detected stall in rtnl_newlink
testing release v4.19
testing commit 84df9525b0c27f3ebc2ebb1864fa62a97fdedb7d with gcc (GCC) 8.1.0
kernel signature: 0ac5477c001ba05c1e5ffab4d5d0164e3124bbfd80cebdcb99b467eb28f8d808
run #0: crashed: KASAN: use-after-free Write in __alloc_skb
run #1: crashed: INFO: rcu detected stall in rtnl_newlink
run #2: crashed: INFO: rcu detected stall in rtnl_newlink
run #3: crashed: INFO: rcu detected stall in rtnl_newlink
run #4: crashed: INFO: rcu detected stall in rtnl_newlink
run #5: crashed: INFO: rcu detected stall in rtnl_newlink
run #6: crashed: INFO: rcu detected stall in rtnl_newlink
run #7: crashed: INFO: rcu detected stall in rtnl_newlink
run #8: crashed: INFO: rcu detected stall in rtnl_newlink
run #9: crashed: INFO: rcu detected stall in rtnl_newlink
testing release v4.18
testing commit 94710cac0ef4ee177a63b5227664b38c95bbf703 with gcc (GCC) 8.1.0
kernel signature: 3aa22dcb11bb8c22b072e3a9f3c0facf08fe7a5d0fbd5e98538733a130568663
run #0: crashed: KASAN: use-after-free Write in __alloc_skb
run #1: crashed: INFO: rcu detected stall in rtnl_newlink
run #2: crashed: INFO: rcu detected stall in rtnl_newlink
run #3: crashed: INFO: rcu detected stall in corrupted
run #4: crashed: INFO: rcu detected stall in rtnl_newlink
run #5: crashed: INFO: rcu detected stall in corrupted
run #6: crashed: INFO: rcu detected stall in corrupted
run #7: crashed: INFO: rcu detected stall in corrupted
run #8: crashed: INFO: rcu detected stall in rtnl_newlink
run #9: crashed: INFO: rcu detected stall in rtnl_newlink
testing release v4.17
testing commit 29dcea88779c856c7dc92040a0c01233263101d4 with gcc (GCC) 8.1.0
kernel signature: e55d5acbde3c75b8cf54ecc78eda4fed49d3570fc46b86ef265ea8b15352e62e
run #0: crashed: KASAN: use-after-free Write in __alloc_skb
run #1: crashed: KASAN: use-after-free Write in __alloc_skb
run #2: crashed: INFO: rcu detected stall in corrupted
run #3: crashed: INFO: rcu detected stall in corrupted
run #4: crashed: INFO: rcu detected stall in rtnl_newlink
run #5: crashed: INFO: rcu detected stall in corrupted
run #6: crashed: INFO: rcu detected stall in corrupted
run #7: crashed: INFO: rcu detected stall in rtnl_newlink
run #8: crashed: INFO: rcu detected stall in corrupted
run #9: crashed: INFO: rcu detected stall in rtnl_newlink
testing release v4.16
testing commit 0adb32858b0bddf4ada5f364a84ed60b196dbcda with gcc (GCC) 8.1.0
kernel signature: 29878005d92c900dc9511eb1fedcb1eb1b4216524f4913ccce5a416dccc39acf
run #0: crashed: INFO: rcu detected stall in corrupted
run #1: crashed: INFO: rcu detected stall in rtnl_newlink
run #2: crashed: INFO: rcu detected stall in corrupted
run #3: crashed: INFO: rcu detected stall in rtnl_newlink
run #4: crashed: INFO: rcu detected stall in corrupted
run #5: crashed: INFO: rcu detected stall in corrupted
run #6: crashed: INFO: rcu detected stall in rtnl_newlink
run #7: crashed: INFO: rcu detected stall in corrupted
run #8: crashed: INFO: rcu detected stall in corrupted
run #9: crashed: INFO: rcu detected stall in rtnl_newlink
testing release v4.15
testing commit d8a5b80568a9cb66810e75b182018e9edb68e8ff with gcc (GCC) 8.1.0
kernel signature: db8d9f1ffc9969aed83f52115a0b1f1997078175bf5f3f0658e538a4414240e8
run #0: crashed: KASAN: use-after-free Write in __alloc_skb
run #1: crashed: INFO: rcu detected stall in rtnl_newlink
run #2: crashed: INFO: rcu detected stall in corrupted
run #3: crashed: INFO: rcu detected stall in corrupted
run #4: crashed: INFO: rcu detected stall in rtnl_newlink
run #5: crashed: INFO: rcu detected stall in rtnl_newlink
run #6: crashed: INFO: rcu detected stall in rtnl_newlink
run #7: crashed: INFO: rcu detected stall in corrupted
run #8: crashed: INFO: rcu detected stall in rtnl_newlink
run #9: crashed: INFO: rcu detected stall in rtnl_newlink
testing release v4.14
testing commit bebc6082da0a9f5d47a1ea2edc099bf671058bd4 with gcc (GCC) 8.1.0
kernel signature: b424720c4a3e6623efdd2e0357ec1b64f3c8027e7e43ebf37dba6d587789c4a5
run #0: crashed: BUG: unable to handle kernel paging request in __alloc_skb
run #1: crashed: INFO: rcu detected stall in corrupted
run #2: crashed: INFO: rcu detected stall in rtnl_newlink
run #3: crashed: INFO: rcu detected stall in rtnl_newlink
run #4: crashed: INFO: rcu detected stall in rtnl_newlink
run #5: crashed: INFO: rcu detected stall in rtnl_newlink
run #6: crashed: INFO: rcu detected stall in rtnl_newlink
run #7: crashed: INFO: rcu detected stall in corrupted
run #8: crashed: INFO: rcu detected stall in corrupted
run #9: crashed: INFO: rcu detected stall in rtnl_newlink
testing release v4.13
testing commit 569dbb88e80deb68974ef6fdd6a13edb9d686261 with gcc (GCC) 8.1.0
kernel signature: b65becc70d2f979e20b76a318a99377b450be57fc7bb7d4c7558633b4a34cda3
run #0: crashed: BUG: unable to handle kernel paging request in __alloc_skb
run #1: crashed: KASAN: slab-out-of-bounds Write in mld_newpack
run #2: crashed: BUG: unable to handle kernel paging request in __alloc_skb
run #3: crashed: INFO: rcu detected stall in corrupted
run #4: crashed: INFO: rcu detected stall in corrupted
run #5: crashed: INFO: rcu detected stall in corrupted
run #6: crashed: INFO: rcu detected stall in corrupted
run #7: crashed: INFO: rcu detected stall in rtnl_newlink
run #8: crashed: INFO: rcu detected stall in rtnl_newlink
run #9: crashed: INFO: rcu detected stall in corrupted
testing release v4.12
testing commit 6f7da290413ba713f0cdd9ff1a2a9bb129ef4f6c with gcc (GCC) 8.1.0
kernel signature: 057615087ff8e13d93182539b952e33fa95658bc3d8ec28e47dabf5674f4246d
all runs: crashed: BUG: sleeping function called from invalid context in tap_get_minor
testing release v4.11
testing commit a351e9b9fc24e982ec2f0e76379a49826036da12 with gcc (GCC) 7.3.0
kernel signature: a897f34b8914ffe26fffecdc7eb1eaabab7ad8faf80b09df99c3804788ae357d
all runs: crashed: BUG: sleeping function called from invalid context in tap_get_minor
testing release v4.10
testing commit c470abd4fde40ea6a0846a2beab642a578c0b8cd with gcc (GCC) 5.5.0
kernel signature: 46fc5f6d015d5a1ce576f7cf400b247129b3f9bc57c67a49d99c439a28acb939
run #0: crashed: BUG: unable to handle kernel paging request in __alloc_skb
run #1: crashed: INFO: rcu detected stall in corrupted
run #2: crashed: INFO: rcu detected stall in corrupted
run #3: crashed: INFO: rcu detected stall in rtnl_newlink
run #4: crashed: INFO: rcu detected stall in rtnl_newlink
run #5: crashed: INFO: rcu detected stall in rtnl_newlink
run #6: crashed: INFO: rcu detected stall in corrupted
run #7: crashed: INFO: rcu detected stall in rtnl_newlink
run #8: crashed: INFO: rcu detected stall in rtnl_newlink
run #9: crashed: INFO: rcu detected stall in rtnl_newlink
testing release v4.9
testing commit 69973b830859bc6529a7a0468ba0d80ee5117826 with gcc (GCC) 5.5.0
kernel signature: c23670321300fca790ba978f8bd6fe13ff6b1ca2cbf200a60d59f0d060b78786
run #0: crashed: INFO: rcu detected stall in corrupted
run #1: crashed: INFO: rcu detected stall in rtnl_newlink
run #2: crashed: INFO: rcu detected stall in rtnl_newlink
run #3: crashed: INFO: rcu detected stall in corrupted
run #4: crashed: INFO: rcu detected stall in corrupted
run #5: crashed: INFO: rcu detected stall in rtnl_newlink
run #6: crashed: INFO: rcu detected stall in rtnl_newlink
run #7: crashed: INFO: rcu detected stall in corrupted
run #8: crashed: no output from test machine
run #9: crashed: INFO: rcu detected stall in rtnl_newlink
testing release v4.8
testing commit c8d2bc9bc39ebea8437fd974fdbc21847bb897a3 with gcc (GCC) 5.5.0
kernel signature: c29f54d726e3e04f683e0e5cb9695afca9d4b9c4adf7bc2ecdbd3a6f4cc30b24
run #0: crashed: KASAN: slab-out-of-bounds Write in mld_newpack
run #1: crashed: INFO: rcu detected stall in rtnl_newlink
run #2: crashed: INFO: rcu detected stall in corrupted
run #3: crashed: INFO: rcu detected stall in rtnl_newlink
run #4: crashed: INFO: rcu detected stall in corrupted
run #5: crashed: INFO: rcu detected stall in rtnl_newlink
run #6: crashed: INFO: rcu detected stall in rtnl_newlink
run #7: crashed: INFO: rcu detected stall in rtnl_newlink
run #8: crashed: INFO: rcu detected stall in corrupted
run #9: crashed: INFO: rcu detected stall in corrupted
testing release v4.7
testing commit 523d939ef98fd712632d93a5a2b588e477a7565e with gcc (GCC) 5.5.0
kernel signature: c261481e14c79319fe294f3e3e9de2a9351499784db1a838a3e643604c8d2319
run #0: crashed: INFO: rcu detected stall in corrupted
run #1: crashed: INFO: rcu detected stall in corrupted
run #2: crashed: INFO: rcu detected stall in rtnl_newlink
run #3: crashed: INFO: rcu detected stall in rtnl_newlink
run #4: crashed: INFO: rcu detected stall in corrupted
run #5: crashed: INFO: rcu detected stall in rtnl_newlink
run #6: crashed: INFO: rcu detected stall in rtnl_newlink
run #7: crashed: INFO: rcu detected stall in rtnl_newlink
run #8: crashed: INFO: rcu detected stall in corrupted
run #9: crashed: INFO: rcu detected stall in rtnl_newlink
testing release v4.6
testing commit 2dcd0af568b0cf583645c8a317dd12e344b1c72a with gcc (GCC) 5.5.0
kernel signature: f0ef6d5417d30d29a3ed0089ea2a0d25b419ed8aad6526560beefe6d60bad8fa
all runs: crashed: WARNING in sysfs_warn_dup
revisions tested: 24, total time: 4h20m44.172068119s (build: 2h14m29.444600239s, test: 2h1m26.852780814s)
the crash already happened on the oldest tested release
commit msg: Linux 4.6
crash: WARNING in sysfs_warn_dup
bridge0: port 2(bridge_slave_1) entered blocking state
bridge0: port 2(bridge_slave_1) entered disabled state
device bridge_slave_1 entered promiscuous mode
bond0: Enslaving bond_slave_0 as an active interface with an up link
------------[ cut here ]------------
WARNING: CPU: 0 PID: 5911 at fs/sysfs/dir.c:31 sysfs_warn_dup+0x7b/0xa0 fs/sysfs/dir.c:30
sysfs: cannot create duplicate filename '/class/macvtap/tap50'
Kernel panic - not syncing: panic_on_warn set ...

CPU: 0 PID: 5911 Comm: syz-executor.3 Not tainted 4.6.0-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
 0000000000000000 ffff8800ba32efc8 ffffffff82c65e52 ffffffff85c81040
 ffff8800ba32f0a0 ffffffff85d2bb80 ffffffff8191bd7b 0000000000000009
 ffff8800ba32f090 ffffffff8160d884 0000000041b58ab3 ffffffff868f3a9a
Call Trace:
 [<ffffffff82c65e52>] __dump_stack lib/dump_stack.c:15 [inline]
 [<ffffffff82c65e52>] dump_stack+0x136/0x1d4 lib/dump_stack.c:51
 [<ffffffff8160d884>] panic+0x1af/0x348 kernel/panic.c:152
 [<ffffffff81335ecd>] __warn+0x18d/0x1b0 kernel/panic.c:504
 [<ffffffff81335f82>] warn_slowpath_fmt+0x92/0xb0 kernel/panic.c:527
 [<ffffffff8191bd7b>] sysfs_warn_dup+0x7b/0xa0 fs/sysfs/dir.c:30
 [<ffffffff8191c5f1>] sysfs_do_create_link_sd.isra.0+0xd1/0xf0 fs/sysfs/symlink.c:51
 [<ffffffff8191c653>] sysfs_do_create_link fs/sysfs/symlink.c:80 [inline]
 [<ffffffff8191c653>] sysfs_create_link+0x43/0xb0 fs/sysfs/symlink.c:92
 [<ffffffff83531337>] device_add_class_symlinks drivers/base/core.c:891 [inline]
 [<ffffffff83531337>] device_add+0x677/0x1350 drivers/base/core.c:1086
 [<ffffffff83532378>] device_create_groups_vargs+0x1c8/0x220 drivers/base/core.c:1709
 [<ffffffff83532478>] device_create_vargs drivers/base/core.c:1749 [inline]
 [<ffffffff83532478>] device_create+0x88/0xa0 drivers/base/core.c:1785
 [<ffffffff838d1764>] macvtap_device_event+0x1c4/0x2a0 drivers/net/macvtap.c:1298
 [<ffffffff81399feb>] notifier_call_chain+0x8b/0x170 kernel/notifier.c:93
 [<ffffffff8139a0f1>] __raw_notifier_call_chain kernel/notifier.c:394 [inline]
 [<ffffffff8139a0f1>] raw_notifier_call_chain+0x11/0x20 kernel/notifier.c:401
 [<ffffffff84928557>] call_netdevice_notifiers_info+0x47/0x80 net/core/dev.c:1643
 [<ffffffff8494cfa8>] call_netdevice_notifiers net/core/dev.c:1659 [inline]
 [<ffffffff8494cfa8>] register_netdevice+0x8e8/0xd00 net/core/dev.c:7027
 [<ffffffff838c8eb9>] macvlan_common_newlink+0x8b9/0x1090 drivers/net/macvlan.c:1316
 [<ffffffff838cfb2f>] macvtap_newlink+0xbf/0x110 drivers/net/macvtap.c:471
 [<ffffffff8497da5b>] rtnl_newlink+0xd4b/0x1230 net/core/rtnetlink.c:2466
 [<ffffffff84978502>] rtnetlink_rcv_msg+0x222/0x680 net/core/rtnetlink.c:3513
 [<ffffffff84afbb22>] netlink_rcv_skb+0x242/0x350 net/netlink/af_netlink.c:2277
 [<ffffffff849782d5>] rtnetlink_rcv+0x25/0x30 net/core/rtnetlink.c:3519
 [<ffffffff84afa6ba>] netlink_unicast_kernel net/netlink/af_netlink.c:1214 [inline]
 [<ffffffff84afa6ba>] netlink_unicast+0x3da/0x560 net/netlink/af_netlink.c:1240
 [<ffffffff84afb2eb>] netlink_sendmsg+0x9bb/0xb40 net/netlink/af_netlink.c:1786
 [<ffffffff848d77e5>] sock_sendmsg_nosec net/socket.c:612 [inline]
 [<ffffffff848d77e5>] sock_sendmsg+0xb5/0xf0 net/socket.c:622
 [<ffffffff848db5da>] SYSC_sendto net/socket.c:1648 [inline]
 [<ffffffff848db5da>] SyS_sendto+0x1ca/0x290 net/socket.c:1616
 [<ffffffff85b78600>] entry_SYSCALL_64_fastpath+0x23/0xc1
Kernel Offset: disabled