bisecting cause commit starting from 68845a55c31bd4e00107c6b6585ab0c707782c5c
building syzkaller on 1f7cc1ca26f786658b146bf760d9698390e9bbfb
testing commit 68845a55c31bd4e00107c6b6585ab0c707782c5c with gcc (GCC) 8.1.0
kernel signature: 42e557174400ee734b1850228d7ca0f0a52eaa0a5fee50824c4d1e991304f223
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: 8dbdc9127f917846c85311fcd3381bc2026e9f728bcc43dd822b4d8438a9c3c9
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: 1f3e0a1b7b293f758dc9de9719915b624f0f81d4523a127973149c0d11d7cb01
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 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: d36279f25be700aaebd48acba1513c05f1d303ce0c697072dd6af0824713b2fd
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 v5.4
testing commit 219d54332a09e8d8741c1e1982f5eae56099de85 with gcc (GCC) 8.1.0
kernel signature: 48b717773420fd85440ae82d9ae8c8d854302844d1f78b6336d602e2f261d415
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: 12e7675e5520abbd587f1731a00fd5bb8893d26f0e94df603a4df2c785cc22d6
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 v5.2
testing commit 0ecfebd2b52404ae0c54a878c872bb93363ada36 with gcc (GCC) 8.1.0
kernel signature: fb92f9fa16293308987b247558b82e36227827cadc098ae589d786397911cdc2
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: f181f373ecf9d3f94da50fcabc2f73aaa39a74f224634311d1cea3579562af5b
all runs: crashed: INFO: rcu detected stall in rtnl_newlink
testing release v5.0
testing commit 1c163f4c7b3f621efff9b28a47abb36f7378d783 with gcc (GCC) 8.1.0
kernel signature: 9e8c071108fe31e50d8b74a56e3968c54ae8991cc30a0a07dd19f20210abd6cb
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 v4.20
testing commit 8fe28cb58bcb235034b64cbbb7550a8a43fd88be with gcc (GCC) 8.1.0
kernel signature: 7335f9341b1aa1c12babed2d8cfefcf81f20e9afc3c94cf79752800b23a10db6
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: df03acebc5cd2b2af4d20eac4f0d4baea5f5ce6573cf052a4926bde7278873b4
all runs: crashed: INFO: rcu detected stall in rtnl_newlink
testing release v4.18
testing commit 94710cac0ef4ee177a63b5227664b38c95bbf703 with gcc (GCC) 8.1.0
kernel signature: b8b0d38192645b92e54c96340a23ba0557d9426caaf6ef99eb7442134da79123
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 rtnl_newlink
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 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 v4.17
testing commit 29dcea88779c856c7dc92040a0c01233263101d4 with gcc (GCC) 8.1.0
kernel signature: 0af639cace76edd985b6098d9b32c8303d0d825b84d0a581fdb2ad24306af3bd
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 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 rtnl_newlink
run #8: crashed: INFO: rcu detected stall in rtnl_newlink
run #9: crashed: INFO: rcu detected stall in rtnl_newlink
testing release v4.16
testing commit 0adb32858b0bddf4ada5f364a84ed60b196dbcda with gcc (GCC) 8.1.0
kernel signature: 1ee6f04e60f6224c0b4154d596be13d0717cbfd5aee32a84a07ebcccf29772bf
run #0: crashed: INFO: rcu detected stall in rtnl_newlink
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 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 rtnl_newlink
run #8: crashed: INFO: rcu detected stall in corrupted
run #9: crashed: INFO: rcu detected stall in corrupted
testing release v4.15
testing commit d8a5b80568a9cb66810e75b182018e9edb68e8ff with gcc (GCC) 8.1.0
kernel signature: 32a4f078e616b881d6017ec78bb6e96b7dfaab69d27bf6040a3be2d100ff37c0
run #0: crashed: KASAN: use-after-free Write 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 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 corrupted
run #8: crashed: INFO: rcu detected stall in corrupted
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: d720f0026265e4d5bcebfdbf2341bb167476e978ab38670bb0dc91271a5e8a9e
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: 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 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 rtnl_newlink
testing release v4.13
testing commit 569dbb88e80deb68974ef6fdd6a13edb9d686261 with gcc (GCC) 8.1.0
kernel signature: ef7a28fe1b907463f9c691fd7759e8446d594d5ead14fb284cfe58ac79538a72
run #0: crashed: KASAN: slab-out-of-bounds Write in mld_newpack
run #1: crashed: KASAN: slab-out-of-bounds Write in mld_newpack
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 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 corrupted
testing release v4.12
testing commit 6f7da290413ba713f0cdd9ff1a2a9bb129ef4f6c with gcc (GCC) 8.1.0
kernel signature: 3a9667fbb14bd2eed669b598d9eac0e3692692ff67291d89b1785470f2f0d4c3
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: c5d7c1da810e79d28935ba8762078c6a78c668f2ac38112ec72d80244d8a6465
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: 22607b3a0e67c004fee49d63204562aee337bcee258dd787a171b323dbe8bc4c
run #0: crashed: KASAN: slab-out-of-bounds Write in mld_newpack
run #1: crashed: BUG: unable to handle kernel paging request 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 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 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: dd2c2aea692fdd4719ffe5e6686087bad6eea606a1ad8cabde845a7d273a93f8
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: 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 corrupted
run #8: crashed: INFO: rcu detected stall in rtnl_newlink
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: 701220ff513ec44a66ccd1f9a3bf5940da0d17dd767811e154c9c1ed8bd480a2
run #0: crashed: BUG: unable to handle kernel paging request 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 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 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 v4.7
testing commit 523d939ef98fd712632d93a5a2b588e477a7565e with gcc (GCC) 5.5.0
kernel signature: c83970c53ed1e0c6e318617dcba4f7b3b34dee06d95bb8c651ca45c76493b2da
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 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 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 corrupted
testing release v4.6
testing commit 2dcd0af568b0cf583645c8a317dd12e344b1c72a with gcc (GCC) 5.5.0
kernel signature: b0f2adab2329e72b749d46b57c91bd22cc1147267736668c11cf760457407b85
all runs: crashed: WARNING in sysfs_warn_dup
revisions tested: 24, total time: 4h22m21.872176572s (build: 2h10m46.914044716s, test: 2h7m3.213706918s)
the crash already happened on the oldest tested release
commit msg: Linux 4.6
crash: WARNING in sysfs_warn_dup
device bridge_slave_1 entered promiscuous mode
IPv6: ADDRCONF(NETDEV_UP): bridge0: link is not ready
bond0: Enslaving bond_slave_0 as an active interface with an up link
8021q: adding VLAN 0 to HW filter on device bond0
------------[ cut here ]------------
WARNING: CPU: 0 PID: 5897 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: 5897 Comm: syz-executor.1 Not tainted 4.6.0-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
 0000000000000000 ffff8800b9e3efc8 ffffffff82c65e52 ffffffff85c81040
 ffff8800b9e3f0a0 ffffffff85d2bb80 ffffffff8191bd7b 0000000000000009
 ffff8800b9e3f090 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